Early stage refers to clinical stage I stage II. Breast cancer is a group of malignant tumors caused by genes, hormonal disorders, etc. The breast tissue becomes cancerous and continues to grow indefinitely, and as the disease progresses, the cancer cells may metastasize to other parts of the body through the lymph or bloodstream. Symptoms such as breast lumps, nipple discharge, nipple retraction and breast pain may occur. Non-invasive carcinoma includes intraductal carcinoma, lobular carcinoma in situ and papillary eczematous breast cancer. Non-invasive breast cancer is an early stage breast cancer with a better prognosis. Early invasive carcinoma includes invasive lobular carcinoma, invasive ductal carcinoma, sclerosing carcinoma and medullary carcinoma. Invasive breast cancer is the most common type of breast cancer. Invasive carcinoma includes papillary carcinoma and squamous cell carcinoma. In patients with early-stage breast cancer, the diagnosis can be confirmed by imaging evaluation through ultrasound, MRI, and mammography, and by puncture pathology. When patients are in the early stage of breast cancer, they are advised to relax and not to be anxious, and actively cooperate with doctors for treatment.